Backerboards are a whole world better than Ply, although I'm still not keen on a thin backerboard glued and screwed, in particular for natural stone, so I would specify a 12mm board glued and screwed, or a thick ply to joists then an uncoupling membrane.
Backerboards are a whole world better than Ply, although I'm still not keen on a thin backerboard glued and screwed, in particular for natural stone, so I would specify a 12mm board glued and screwed, or a thick ply to joists then an uncoupling membrane.
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